is not cool even i we have a year warranty.. is not right! i have replace my iPhone 7 plus 256 today for the same issue. i note something. the old iPhone 7 plus i got before has a different noise but for the battery side.. mean left side of the apple logo..
the new iPhone 7 plus that i just got today have the noise between the double camera and the apple logo..
the noise coming for the left side of the apple logo was less loud.. this one now is more loud and like i said is coming from the camera side.. i don't feel good about this.. I'm waiting for the second time replacement i hope this time i will have good luck..
i hope apple have a good explanation for this problem, and a fix too...

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